Machine for pressing inductors into place on the core of dynamoelectric-machine elements and then bending them simultaneously



July 21, 1925.

C. L, COOK PISTON RING Filed Jan. 9, 1922 C: Zee C0012,

affmnm Patented July 21, 1925.

UNITED STATES CHARLES LEE COOK, OF LOUISVILLE, KENTUCKY, ASSIGNOR T0 C.LEE COOK MANU- PATENT OFFICE.

FACTURING COMPANY, OF LOUISVILLE, KENTUCKY, .A CORPORATION OF KEN-TUCKY.

PISTON RING.

Application filed January 9, 1922.

To all whom t may concern.:

Be it known that I, CHARLES LEE COOK, a citizen of the United States,residing at Louisville, in the county of Jefferson and State ofKentucky, have invented certain new and useful Improvements in PistonRings, of which the following is a specification.

The present invention relates to piston packing rings, the object beingto provide a structure that is effective for preventing the passage ofthe actuating fluid past the piston, and is also so constructed thatundue pressure against the cylinder walls with consequent excessive Wearis eliminated.

The preferred embodiment of the invention is illustrated in theaccompanying drawings, wherein Figure 1 is a side elevation of a pistonbody with the improved piston ring therein and illustrated in section,

Figure 2 is a cross sectional view,

Figure 3 is a detail sectional view on the line 3 3 of Figure 2.

In the embodiment disclosed the piston body is illustrated in a somewhatdiagrammatic manner at 4, and is provided with the usual annular groovein which the piston ring is located.

This piston ring consists of two expansible split packing ring sections6 having their outer or peripheral portions provided with coactingflanges 7 forming recesses, the inner wall faces of these recesses beingoppositely inclined, as illustrated at 8. In the recesses are locatedwedge rings 9 having inclined faces 1() that bear against the faces 8.These rings have their opposing portions provided with pockets, asillustrated at 11, and in said pockets are located coiled springs 12that serve to urge the wedge rings 9 apart. Obviously therefore thismovement and the inclined faces 8 and 10 will effect the expansion ofthe ring sections 7 against the cylinder walls.

In order to prevent the actuating fluid having access through the jointsof the ring segments 6 and thus entering behind the packing ring, bridgepieces 13 extend across the joints and are provided with curved flanges14 operating in grooves 15 formed in the ends of the ring segments. Thebridge pieces 13 have their outer faces flush with the faces of the ringsections as will be clear Serial No. 528,081.

by reference to Figure 1. The end portions of the ring segments 6 arefurthermore provided with sockets or openings 16, the inner walls 17 ofwhich constitute abutment shoulders. In these sockets are located theheads 18 of screws 19 that are threaded into the wedge rings 9. It willbe noted that opposite side faces of the said heads are located atdifferent distances from the axis of the screws.

It has been found particularly in marine practice that the ideal pistonring should reciprocate with a minimum amount of tension against thewalls of the cylinder consistent with steam-tight contact, and that ifthis principle is not maintained the packing ring is subject to abnormalwear and hence short life. In the present structure provision is made toinsure the desired automatic expansion, but this expansion is limited bythe stop heads 18 coming into contact with the abutment shoulders andend walls 17 of the openings 16. In actual practice the space betweenthe heads 18 and shoulders 17 is relatively small, but it enables thepacking ring to wear against the walls of the cylinder until all the surfaces are absolutely perfect, and until the space between the shouldersand heads is consumed. The packing ring can then eX- pand no furtheroutwardly and becomes in effect a solid ring that will run indefinitely.lVhen, however, there are signs of leak, the screws may be turned tobring other side faces of the headsinto coacting relation with the stopsto provide small additional amounts of space, which allow for furtherexpansion and thus repeat the process above described. Or if desired,the heads may be dressed down to allow for this additional space. Theheads 18, it will be noted, are spaced a greater distance from the rearwalls of the sockets 16 which permits the rings to spring inward orcollapse, in the eventof undue eXpansion from heat or passing over someforeign substance in the cylinder which occasionally will enter thesame.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction, may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention.

lVhat I claim as new, and desire to secure by Letters Patent, is

1. A packing ring for pistons comprising a pair of oppositely facedsplit ring sections having inner opposing oppositely inclined faces,wedge rings interposed between the ring sections and having inclinedfaces bearing against the inclined faces thereof, the end portions ofthe split ring sections having recesses, bridge pieces in the recessesextending across the joints between the ends of the rings and seated inthe recesses, said split rings having transverse sockets therein outsidethe recesses, and stop lugs engaged in said recesses, permitting limitedexpansion of the rings.

2. A packing ring for pistons comprising a pair of oppositely facedsplit ring sections having opposing oppositely inclined faces, wedgerings interposed between the ring sections and having inclined facesbearing against the inclined faces thereof, springs interposed betweenthe wedge rings, the ends of each of the split ring sections havingsockets opening through their inclined faces, and stop shouldersprojecting from the outer inclined faces of each of the wedge rings,said shoulders being located in the sockets of the adjacent rings andlimiting the expansion of the split ring sections.

P). A split expansible ring member, a bridge member across the jointthereof for limiting the expansion of said ring member, said ring memberbeing freely expansible with respect to the bridge member', and a stopmeans interlocking the bridge member and ring member for limiting therelative movement thereof, said stop being adjustably mounted on one ofthe members and movable with respect tothe other members to vary theamount of expansion allowed to the ring member.

l. A split expansible piston ring having stop shoulders on'oppositesides of the split, and rotatable stops having faces disposedeccentrically to their axes of rotation, the different faces beingadapted to be brought into coaction with the stop shoulders.

ln testimony whereof, I affix my signature in the presence of twowitnesses.

CHARLES LEE COOK.

lllitiiesses:

Roer. C. BALDWIN, ARTHUR G. RosENBAUM.

